Process for the production of paper

A process for the production of paper which comprises;

• (i) providing a suspension containing cellulosic fibres, and optional fillers,
• (ii) adding to said suspension a drainage and retention aids comprising a cationic organic polymer which comprises in polymerized form a cationic monomer having an aromatic group represented by the general formula (I):
• wherein R1 is H or CH3, R2 and R3 are each an alkyl group having from 1 to 3 carbon atoms, A1 is O or NH, B1 is an alkylene group of from 2 to 4 carbon atoms or a hydroxy propylene group, Q is benzyl, and X− is an anionic counterion, wherein the polymer is prepared from a monomer mixture consisting essentially of from 2 50 mole% cationic monomer having an aromatic group and from 98 to 50 mole% (meth)acrylamide;
• and anionic silica-based particles;
• (iii) forming and dewatering the obtained suspension on a wire, wherein the suspension that is dewatered on the wire has a conductivity between 2.4 and 10 mS/cm and obtaining a wet web of paper and white water, recirculating white water and introducing fresh water to form a suspension containing cellulosic fibres, and optional fillers, to be dewatered, wherein the amount of fresh water introduced is less than 20 tons per ton of dry paper produced.

A process for the production of paper which comprises;

• (i) providing a suspension containing cellulosic fibers, and optional fillers,
• (ii) adding to said suspension drainage and retention aids comprising a cationic organic polymer which comprises in polymerized form a cationic monomer having an aromatic group represented by the general formula (I):
• wherein R1, is H or CH3, R2 and R3a are each an alkyl group having from 1 to 3 carbon atoms, A1 is O or NH, B1 is an alkylene group of from 2 to 4 carbon atoms or a hydroxy propylene group, Q is benzyl, and X− is an anionic counterion, wherein the polymer is prepared from a monomer mixture consisting essentially of from 2 to 50 mole% cationic monomer having an aromatic group and from 98 to 50 mole% (meth)acrylamide;
• and anionic organic particles;
• and
• (iii) forming and dewatering the obtained suspension on a wire, wherein the suspension that is dewatered on the wire has a conductivity between 5.5 and 10 mS/cm.